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NE40E V800R010C10SPC500 Configuration Guide - IP Multicast 01

This is NE40E V800R010C10SPC500 Configuration Guide - IP Multicast
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Configuring MLD Snooping

Configuring MLD Snooping

Multicast Listener Discovery (MLD) snooping enables a Layer 2 device to listen to and analyze MLD messages exchanged between a connected Layer 3 device and downstream user hosts. The Layer 2 device then uses the message information to set up multicast forwarding entries to implement on-demand multicast data forwarding at the data link layer.

Usage Scenario

On an IPv6 multicast network, after an upstream device sends the service flow of a multicast program, a Layer 2 device at the edge of the access layer forwards the flow to multicast users. The users can then enjoy the multicast program service. As shown in Figure 18-14, multicast data messages are broadcast at the data link layer by default, causing bandwidth waste.

To resolve this issue, configure MLD snooping on the Layer 2 device, allowing this device to listen to the MLD messages exchanged between the upstream device and downstream hosts. The Layer 2 device can then analyze the messages and generate Layer 2 multicast forwarding entries based on the message information to implement on-demand multicast data forwarding at the link layer.

Figure 18-14 Multicast message transmission before and after MLD snooping is configured on a Layer 2 device

On the network shown in Figure 18-14, Receiver A and Receiver B request the service of a multicast group, but Receiver C does not. Before MLD snooping is configured, the Layer 2 device broadcasts the multicast data at the data link layer, and all the receivers can receive the data. After MLD snooping is configured, the Layer 2 device sends the multicast data only to Receiver A and Receiver B who request the data. Therefore, Receiver C does not receive the data of the multicast group.

Pre-configuration Tasks

  • Configure basic VLAN and VPLS functions.

Data Preparation

To configure MLD snooping, you need the following data.

No.

Data

1

VLAN ID or VSI name (for which MLD snooping needs to be configured)

2

(Optional) Router interface aging time

3

(Optional) Aging time of dynamic group members, and the range of group and source addresses that hosts can promptly join or leave

4

(Optional) Range and number of multicast groups to be limited

5

(Optional) Aging time of entries triggered by multicast traffic

Configuration Procedures

Perform one or more of the following configurations as required.

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Updated: 2019-01-03

Document ID: EDOC1100055017

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